so this is my view after seeing the precap.maybe after razia sees zoya alive she scold tanveer for lying about zoya being dead(after pushing zoya from cliff tanveer informs razia that zoya is dead)or for not being able to kill her.she threatens tanveer that she will reveal her truth to asad if zoya is comes to know about her abbu.tanveer knows that zoya is quiet obly because she promised to give her information about her abbu but if she does razia will not leave her.so she decides to kill zoya which was good as she gets caught by asad.
an unreasonable post but i just thought that this can happen so decided to share.